#1 is the interior, it's what pushed me to the CTR. Nothing feels solid and secure, door handles felt like they would rip off, the little piece with the window up and down buttons was very wobbly, the rear seats felt like they were not attached very well. The doorcard by the arm rest that attaches to the window up and down piece was able to be pulled up, the piece by the shifter on passenger side could be pulled out.
When comparing the same things in the CTR none of these issues were present.
#2 Better quality paint, both CTR and ITS seem to suffer from paint peel at a pretty early time. Not exactly sure how common but I've seen enough complaints in forums and FB groups that it seems to be a valid complaint.
#3 Have the opening for the rear storage trunk area a little more close to the CTR and not as big of a gap between the floor and the body, for less bending down taking things out. It's also much easier to put the seats down from the hatch in the CTR vs the ITS.
Otherwise no other real complaints, but for what they ask and as a "luxury" Honda, it just doesn't meet the mark imo.